Beautiful Cousins - Warm and Cool

I'm drawing this pastel very much the way I would do an oil painting, so the first layer has nothing to do with putting in the colours, just with adding some tonal values, showing what is warm and cool, regardless of what colour they'll be in the end. I like this stage because it really sets outs values for the final piece, and tends to make it simpler in the next few stages in terms of shadows and highlights.